Endress+Hauser Deltabar S FMD78 User manual

BA00301P/00/EN/16.14
71254467
valid from Software version:
04.00.zz
Operating Instructions
Deltabar S FMD76/77/78, PMD70/75
Differential pressure measurement

Overview of documentation Deltabar S FMD76/77/78, PMD70/75 with FOUNDATION Fieldbus
2Endress+Hauser
Overview of documentation
Device Documentation Content Remarks
Deltabar S FOUNDATION
Fieldbus
Technical Information TI00382P Technical data The documentation is available on the Internet.
See: www.endress.com Download
Operating Instructions BA00301P – Identification
– Installation
– Wiring
– Operation
– Commissioning, description of
Quick Setup menus
– Maintenance
– Troubleshooting and spare parts
– Appendix: illustration of menus
– The documentation can be found on the
documentation CD supplied.
– The documentation is also available on the
Internet.
See: www.endress.com Download
Operating Instructions BA00303P – Examples of configuration for
pressure, level and flow
measurement
– Description of parameters
– Troubleshooting
– Appendix: illustration of menus
– The documentation can be found on the
documentation CD supplied.
– The documentation is also available on the
Internet.
See: www.endress.com Download
Brief Operating Instructions KA01024P – Installation
– Wiring
– Local operation
– Commissioning
– Description of Quick Setup menus
– The documentation is supplied with the
device.
– The documentation can also be found on the
documentation CD supplied.
– The documentation is also available on the
Internet.
See: www.endress.com Download
Fold-out brochure KA00252P – Wiring
– Operation without display
– Description of Quick Setup menus
– Operation HistoROM®/M-DAT
– The documentation is supplied with the
device. See cover of the terminal
compartment.
– The documentation can also be found on the
documentation CD supplied.

Deltabar S FMD76/77/78, PMD70/75 with FOUNDATION Fieldbus Table of contents
Endress+Hauser 3
Table of contents
1 Safety instructions . . . . . . . . . . . . . . . . 4
1.1 Designated use . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.2 Installation, commissioning and operation . . . . . . . . 4
1.3 Operational safety and process safety . . . . . . . . . . . . 4
1.4 Notes on safety conventions and icons . . . . . . . . . . . 5
2 Identification . . . . . . . . . . . . . . . . . . . . 6
2.1 Product identification . . . . . . . . . . . . . . . . . . . . . . . 6
2.2 Device designation . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.3 Scope of delivery . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.4 CE mark, Declaration of Conformity . . . . . . . . . . . . 8
2.5 Registered trademarks . . . . . . . . . . . . . . . . . . . . . . . 8
3 Installation . . . . . . . . . . . . . . . . . . . . . . 9
3.1 Incoming acceptance and storage . . . . . . . . . . . . . . . 9
3.2 Installation conditions . . . . . . . . . . . . . . . . . . . . . . . 9
3.3 Installation instructions . . . . . . . . . . . . . . . . . . . . . . 9
3.4 Post-installation check . . . . . . . . . . . . . . . . . . . . . . 21
4 Wiring . . . . . . . . . . . . . . . . . . . . . . . . 22
4.1 Connecting the device . . . . . . . . . . . . . . . . . . . . . . 22
4.2 Connecting the measuring unit . . . . . . . . . . . . . . . 23
4.3 Overvoltage protection (optional) . . . . . . . . . . . . . . 24
4.4 Post-connection check . . . . . . . . . . . . . . . . . . . . . . 24
5 Operation . . . . . . . . . . . . . . . . . . . . . . 25
5.1 Onsite display (optional) . . . . . . . . . . . . . . . . . . . . 25
5.2 Operating elements . . . . . . . . . . . . . . . . . . . . . . . . 27
5.3 FOUNDATION Fieldbus interface . . . . . . . . . . . . . 29
5.4 Local operation – onsite display connected . . . . . . . 41
5.5 FieldCare . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
5.6 HistoROM®/M-DAT (optional) . . . . . . . . . . . . . . 44
5.7 Locking/unlocking operation . . . . . . . . . . . . . . . . . 46
5.8 Simulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
5.9 Factory setting (reset) . . . . . . . . . . . . . . . . . . . . . . 48
6 Commissioning. . . . . . . . . . . . . . . . . . 51
6.1 Function check . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
6.2 Commissioning via an FF configuration program . . 51
6.3 Selecting the language and measuring mode . . . . . 53
6.4 Position adjustment . . . . . . . . . . . . . . . . . . . . . . . . 54
6.5 Flow measurement . . . . . . . . . . . . . . . . . . . . . . . . 56
6.6 Level measurement . . . . . . . . . . . . . . . . . . . . . . . . 59
6.7 Differential pressure measurement . . . . . . . . . . . . . 66
6.8 Scaling the OUT parameter . . . . . . . . . . . . . . . . . . 68
6.9 Configuring event behavior in accordance with
FOUNDATION Fieldbus Specification FF912 Field
Diagnostic Profile . . . . . . . . . . . . . . . . . . . . . . . . . 69
7 Maintenance. . . . . . . . . . . . . . . . . . . . 79
7.1 Cleaning instructions . . . . . . . . . . . . . . . . . . . . . . . 79
8 Diagnostics and troubleshooting . . . . . 80
8.1 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
8.2 Diagnostic information on local display . . . . . . . . . . 81
8.3 Diagnostic event in the operating tool . . . . . . . . . . 82
8.4 Diagnostic messages in the DIAGNOSTIC Transducer
Block (TRDDIAG) . . . . . . . . . . . . . . . . . . . . . . . . . 83
8.5 Overview of diagnostic events . . . . . . . . . . . . . . . . 86
8.6 Response of outputs to errors . . . . . . . . . . . . . . . . . 95
8.7 Confirming messages . . . . . . . . . . . . . . . . . . . . . . . 96
8.8 Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
8.9 Repair of Ex-certified devices . . . . . . . . . . . . . . . . . 96
8.10 Spare Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
8.11 Return . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
8.12 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
8.13 Software history . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
9 Technical data . . . . . . . . . . . . . . . . . . . 99
10 Appendix. . . . . . . . . . . . . . . . . . . . . . . 99
10.1 Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109

Safety instructions Deltabar S FMD76/77/78, PMD70/75 with FOUNDATION Fieldbus
4Endress+Hauser
1 Safety instructions
1.1 Designated use
The Deltabar S is a differential pressure transmitter for measuring differential pressure, flow and
level.
The manufacturer accepts no liability for damages resulting from incorrect use or use other than that
designated.
1.2 Installation, commissioning and operation
The device is designed to meet state-of-the-art safety requirements and complies with applicable
standards and EC regulations. If installed incorrectly or used for applications for which it is not
intended, however, it is possible that application-related dangers may arise, e.g. product overflow
due to incorrect installation or configuration. For this reason, installation, connection to the
electricity supply, commissioning, operation and maintenance of the measuring system must only
be carried out by trained, qualified specialists authorized to perform such work by the facility's
owner-operator. The specialist staff must have read and understood these Operating Instructions
and must follow the instructions they contain. Modifications and repairs to the device are
permissible only if they are expressly approved in the Operating Instructions. Pay particular
attention to the technical data on the nameplate.
1.3 Operational safety and process safety
Alternative monitoring measures must be taken to ensure operational safety and process safety
during configuration, testing and maintenance work on the device.
1.3.1 Hazardous areas (optional)
Devices for use in hazardous areas are fitted with an additional nameplate (ä6). If using the
measuring system in hazardous areas, the appropriate national standards and regulations must be
observed. The device is accompanied by separate "Ex documentation", which is an integral part of
these Operating Instructions. The installation regulations, connection values and safety instructions
listed in this Ex document must be observed. The documentation number of the related safety
instructions is also indicated on the additional nameplate.
• Ensure that all personnel are suitably qualified.

Deltabar S FMD76/77/78, PMD70/75 with FOUNDATION Fieldbus Safety instructions
Endress+Hauser 5
1.4 Notes on safety conventions and icons
In order to highlight safety-relevant or alternative operating procedures in the manual, the following
conventions have been used, each indicated by a corresponding icon in the margin.
Symbol Meaning
#Warning!
A warning highlights actions or procedures which, if not performed correctly, will lead to personal
injury, a safety hazard or destruction of the instrument.
"Caution!
Caution highlights actions or procedures which, if not performed correctly, may lead to personal
injury or incorrect functioning of the instrument.
!Note!
A note highlights actions or procedures which, if not performed correctly, may indirectly affect
operation or may lead to an instrument response which is not planned.
0Device certified for use in explosion hazardous area
If the device has this symbol embossed on its nameplate, it can be installed in an explosion
hazardous area or a non-explosion hazardous area, according to the approval.
-Explosion hazardous area
Symbol used in drawings to indicate explosion hazardous areas.
– Devices used in hazardous areas must possess an appropriate type of protection.
.
Safe area (non-explosion hazardous area)
Symbol used in drawings to indicate, if necessary, non-explosion hazardous areas.
– Devices used in hazardous areas must possess an appropriate type of protection. Lines used in
hazardous areas must meet the necessary safety-related characteristic quantities.
%Direct voltage
A terminal to which or from which a direct current or voltage may be applied or supplied.
&Alternating voltage
A terminal to which or from which an alternating (sine-wave) current or voltage may be applied
or supplied.
)Grounded terminal
A grounded terminal, which as far as the operator is concerned, is already grounded by means of
an earth grounding system.
*Protective grounding (earth) terminal
A terminal which must be connected to earth ground prior to making any other connection to the
equipment.
+Equipotential connection (earth bonding)
A connection made to the plant grounding system which may be of type e.g. neutral star or
equipotential line according to national or company practice.
Temperature resistance of the connection cables
States, that the connection cables must be resistant to a temperature of at least 85 °C (185 °F).
Safety instruction
For safety instructions refer to the manual for the appropriate instrument version.
t >85°C

Identification Deltabar S FMD76/77/78, PMD70/75 with FOUNDATION Fieldbus
6Endress+Hauser
2 Identification
2.1 Product identification
The following options are available for identification of the measuring device:
• Nameplate specifications
• Order code with breakdown of the device features on the delivery note
• Enter serial numbers from nameplates in W@M Device Viewer
(www.endress.com/deviceviewer): All information about the measuring device is displayed.
For an overview of the technical documentation provided, enter the serial number from the
nameplates in the W@M Device Viewer (www.endress.com/deviceviewer).
2.2 Device designation
2.2.1 Nameplates
!Note!
• The MWP (maximum working pressure) is specified on the nameplate. This value refers to a
reference temperature of 20°C (68°F) or 100°F (38 °C) for ANSI flanges.
• The pressure values permitted at higher temperatures can be found in the following standards:
– EN 1092-1: 2001 Tab. 18 1)
– ASME B 16.5a – 1998 Tab. 2-2.2 F316
– ASME B 16.5a – 1998 Tab. 2.3.8 N10276
– JIS B 2220
• For PMD70 and PMD75, the MWP applies for the temperature ranges specified in Technical
Information TI00382P in the "Ambient temperature range" and "Process temperature limits"
sections.
• The test pressure corresponds to the overpressure limit (OPL) of the device = MWP x 1.5.
• The Pressure Equipment Directive (EC Directive 97/23/EC) uses the abbreviation "PS". The
abbreviation "PS" corresponds to the MWP (maximum working pressure) of the measuring
device.
Aluminium housing (T14/T15) and stainless steel housing (T14)
A0016056
Fig. 1: Nameplate
1 Device name
2 Order code (for re-orders)
3 Extended order code (complete)
4 Technical data
5 Serial number (for identification)
6 Address of manufacturer
1) With regard to their stability-temperature property, the materials 1.4435 and 1.4404 are grouped together under 13EO
in EN 1092-1 Tab. 18. The chemical composition of the two materials can be identical.
Ser. no.:
Order code:
Ext. order code:
25
6
3
4
1

Deltabar S FMD76/77/78, PMD70/75 with FOUNDATION Fieldbus Identification
Endress+Hauser 7
Devices for use in hazardous areas are fitted with an additional nameplate.
A0021222
Fig. 2: Additional nameplate
1 Approval-specific information
2 Document number for safety instructions or drawing number
Devices suitable for oxygen applications or with PVDF process connection are fitted with an
additional nameplate.
A0022683
Fig. 3: Additional nameplate
1 Application limits
Hygenic stainless steel housing (T17)
A0021552
Fig. 4: Nameplate
1 Device name
2 Address of manufacturer
3 Order code (for re-orders)
4 Extended order code (complete)
5 Serial number (for identification)
6 Technical data
7 Approval-specific information and document number for safety instructions or drawing number
2.2.2 Identifying the sensor type
See parameter "Sensor Meas.Type" in Operating Instruction BA00303P. The Operating Instruction
BA00303P can be found on the supplied documentation CD.
2
1
1
2
7
3
4
5
6
1
Ser. no.:
Order code:
Ext. ord. cd.:

Identification Deltabar S FMD76/77/78, PMD70/75 with FOUNDATION Fieldbus
8Endress+Hauser
2.3 Scope of delivery
The scope of delivery comprises:
• Deltabar S differential pressure transmitter
• For PMD70 and PMD75 with side flanges made of AISI 316L or C22.8: additionally 2 vent valves,
AISI 316L
• PMD75 with side flanges made of AISI 316L or C22.8 and side vent: additionally 4 locking
screws, AISI 316L
• For devices with the "HistoROM/M-DAT" option: CD-ROM with Endress+Hauser operating
program and documentation
• Optional accessories
Documentation supplied:
• Operating Instructions BA00301P and BA00303P and the Safety Instructions, Functional Safety
Manual and brochures can be found on the documentation CD supplied. ä2, "Overview of
documentation" section.
• Brief Operating Instructions KA01024P
• Fold-out brochure KA00252P
• Final inspection report
• Additional Safety Instructions with ATEX, IECEx and NEPSI devices
• Optional: factory calibration form, test certificates
2.4 CE mark, Declaration of Conformity
The devices are designed to meet state-of-the-art safety requirements, have been tested and left the
factory in a condition in which they are safe to operate. The devices comply with the applicable
standards and regulations as listed in the EC Declaration of Conformity and thus comply with the
statutory requirements of the EC Directives. Endress+Hauser confirms the conformity of the device
by affixing to it the CE mark.
2.5 Registered trademarks
KALREZ, VITON, TEFLON
Registered trademarks of E.I. Du Pont de Nemours & Co., Wilmington, USA
TRI-CLAMP
Registered trademark of Ladish & Co., Inc., Kenosha, USA
FOUNDATIONTM Fieldbus
Registered trademark of the Fieldbus Foundation Austin, Texas, USA

Deltabar S FMD76/77/78, PMD70/75 with FOUNDATION Fieldbus Installation
Endress+Hauser 9
3 Installation
3.1 Incoming acceptance and storage
3.1.1 Incoming acceptance
• Check the packaging and the contents for damage.
• Check the shipment, make sure nothing is missing and that the scope of supply matches your order.
3.1.2 Transport
"Caution!
Follow the safety instructions and transport conditions for devices of more than 18 kg (39.69 lbs).
Transport the measuring device to the measuring point in its original packaging or at the process
connection.
3.1.3 Storage
The device must be stored in a dry, clean area and protected against impact (EN 837-2).
Storage temperature range:
• –40 to +90°C (–40 to +194 °F)
• Onsite display: –40 to +85°C (–40 to +185°F)
• Separate housing: –40 to +60°C (–40 to +140°F)
3.2 Installation conditions
3.2.1 Dimensions
For dimensions, please refer to the Technical Information for Deltabar S TI00382P, "Mechanical
construction" section. ä2 "Overview of documentation".
3.3 Installation instructions
!Note!
• Due to the orientation of the Deltabar S, there may be a shift in the measured value, i.e. when
the container is empty or partially full, the measured value does not display zero. You can correct
this zero point shift using the "Zero" key on the electronic insert or externally on the device or via
the onsite display. ä27, Section 5.2.1 "Position of the operating elements", ä28,
Section 5.2.3 "Function of the operating elements – onsite display connected" and ä54,
Section 6.4 "Position adjustment"..
• For FMD77 and FMD78, please refer to Section 3.3.4 "Installation instructions for devices with
diaphragm seals (FMD78)", ä16.
• General recommendations for routing the pressure piping can be found in DIN 19210 "Methods
for measurement of fluid flow; differential piping for flow measurement devices" or the
corresponding national or international standards.
• Using a three-way or five-way valve manifold allows for easy commissioning, installation and
maintenance without interrupting the process.
• When routing the pressure piping outdoors, ensure that sufficient antifreeze protection is used,
e.g. by using pipe heat tracing.
• Install the pressure piping with a monotonic gradient of at least 10%.
• To ensure optimal readability of the onsite display, it is possible to rotate the housing up to 380°.
ä21, Section 3.3.9 "Rotating the housing".
• Endress+Hauser offers a mounting bracket for installing on pipes or walls.
ä19, Section 3.3.7 "Wall and pipe-mounting (optional)".

Installation Deltabar S FMD76/77/78, PMD70/75 with FOUNDATION Fieldbus
10 Endress+Hauser
3.3.1 Installation for flow measurement
!Note!
For more information about flow measurement with the Deltabar S differential pressure transmitter
• Deltabar S with orifice plate (TI00422P, Deltatop DO6x)
• Deltabar S with Pitot tube (TI00425P, Deltatop DP6x)
Flow measurement in gases with PMD70/PMD75
P01-PMD75xxx-11-xx-xx-xx-000
Fig. 5: Measuring arrangement for flow measurement in gases with PMD75
1 Deltabar S, here PMD75
2 Three-way valve manifold
3 Shutoff valves
4 Orifice plate or Pitot tube
• Mount the Deltabar S above the measuring point so that the condensate can run off into the
process piping.
Flow measurement in steam with PMD70/PMD75
P01-PMD75xxx-11-xx-xx-xx-001
Fig. 6: Measuring arrangement for flow measurement in steam with PMD75
1 Condensate traps
2 Orifice plate or Pitot tube
3 Shutoff valves
4 Deltabar S, here PMD75
5 Separator
6 Drain valves
7 Three-way valve manifold
• Mount the Deltabar S below the measuring point.
• Mount the condensate traps at the same level as the tapping points and at the same distance to
the Deltabar S.
• Prior to commissioning, fill the pressure piping to the level of the condensate traps.
➀
➂
➃
+–
➁
➀
➁
➃
+–
➂
➅
➄
➆
➂
➅
➄

Deltabar S FMD76/77/78, PMD70/75 with FOUNDATION Fieldbus Installation
Endress+Hauser 11
Flow measurement in liquids with PMD70/PMD75
P01-PMD75xxx-11-xx-xx-xx-002
Fig. 7: Measuring arrangement for flow measurement in liquids with PMD75
1 Orifice plate or Pitot tube
2 Shutoff valves
3 Deltabar S, here PMD75
4Separator
5 Drain valves
6 Three-way valve manifold
• Mount the Deltabar S below the measuring point so that the pressure piping is always filled with
liquid and gas bubbles can run back into the process piping.
• When measuring in media with solid parts, such as dirty liquids, installing separators and drain
valves is useful for capturing and removing sediment.
3.3.2 Installation for level measurement
Level measurement in an open container with PMD70/PMD75
P01-PMD75xxx-11-xx-xx-xx-003
Fig. 8: Measuring arrangement for level measurement in an open container with PMD75
1 The negative side is open to atmospheric pressure
2 Deltabar S, here PMD75
3 Shutoff valve
4Separator
5 Drain valve
• Mount the Deltabar S below the lower measuring connection so that the pressure piping is always
filled with liquid.
• The negative side is open to atmospheric pressure.
• When measuring in media with solid parts, such as dirty liquids, installing separators and drain
valves is useful for capturing and removing sediment.
+–
➀
➂
➅
➁
➃
➄
➁
➃
➄
+
➃
➂
➀
➁
➄
patm
min. patm

Installation Deltabar S FMD76/77/78, PMD70/75 with FOUNDATION Fieldbus
12 Endress+Hauser
Level measurement in an open container with FMD76/FMD77
P01-FMD76xxx-11-xx-xx-xx-003
Fig. 9: Measuring arrangement for level measurement in an open container with FMD76
1 Deltabar S, here FMD76
2 The negative side is open to atmospheric pressure
• Mount the Deltabar S directly on the container. ä18, Section 3.3.5 "Seal for flange
mounting".
• The negative side is open to atmospheric pressure.
Level measurement in a closed container with PMD70/PMD75
P01-PMD75xxx-11-xx-xx-xx-004
Fig. 10: Measuring arrangement for level measurement in a closed container with PMD75
1 Shutoff valves
2 Deltabar S, PMD75
3 Separator
4 Drain valves
5 Three-way valve manifold
• Mount the Deltabar S below the lower measuring connection so that the pressure piping is always
filled with liquid.
• Always connect the impulse piping of negative side above the maximum level.
• When measuring in media with solid parts, such as dirty liquids, installing separators and drain
valves is useful for capturing and removing sediment.
➁
+
–
min. ➀
patm
patm
+
–➀
➂
➃
➄
➁
➀
➂
➃
min.
max.

Deltabar S FMD76/77/78, PMD70/75 with FOUNDATION Fieldbus Installation
Endress+Hauser 13
Level measurement in a closed container with FMD76/FMD77
P01-FMD76xxx-11-xx-xx-xx-004
Fig. 11: Measuring arrangement for level measurement in a closed container with FMD76
1 Shutoff valve
2Separator
3 Drain valve
4 Deltabar S, here FMD76
• Mount the Deltabar S directly on the container. ä18, Section 3.3.5 "Seal for flange
mounting".
• Always connect the impulse piping of negative side above the maximum level.
• When measuring in media with solid parts, such as dirty liquids, installing separators and drain
valves is useful for capturing and removing sediment.
Level measurement in a closed container with FMD78
P01-FMD78xxx-11-xx-xx-xx-000
Fig. 12: Measuring arrangement for level measurement in a closed container with FMD78
1 Deltabar S, here FMD78
• Mount the Deltabar S below the lower diaphragm seal. ä16, Section 3.3.4 "Installation
instructions for devices with diaphragm seals (FMD78)".
• The ambient temperature should be the same for both capillaries.
!Note!
Level measurement is only ensured between the upper edge of the lower diaphragm seal and the
lower edge of the upper diaphragm seal.
+
–
➃➂
➀
➁
max.
min.
+
–
➀
min.
max.

Installation Deltabar S FMD76/77/78, PMD70/75 with FOUNDATION Fieldbus
14 Endress+Hauser
Level measurement in a closed container with superimposed steam with PMD70/
PMD75
P01-PMD75xxx-11-xx-xx-xx-005
Fig. 13: Measuring arrangement for level measurement in a container with superimposed steam with PMD75
1 Condensate trap
2 Shutoff valves
3 Deltabar S, here PMD75
4 Separator
5 Drain valves
6 Three-way valve manifold
• Mount the Deltabar S below the lower measuring connection so that the pressure piping is always
filled with liquid.
• Always connect the impulse piping of negative side above the maximum level.
• A condensate trap ensures constant pressure on the negative side.
• When measuring in media with solid parts, such as dirty liquids, installing separators and drain
valves is useful for capturing and removing sediment.
Level measurement in a closed container with superimposed steam with FMD76/
FMD77
P01-FMD76xxx-11-xx-xx-xx-005
Fig. 14: Measuring arrangement for level measurement in a container with superimposed steam with FMD76
1 Condensate trap
2 Shutoff valve
3 Separator
4 Drain valve
5 Deltabar S, here FMD76
+
–
➂
➀
➁
➃
➄
➅
➃
➄
min.
max.
➁
+
–
➃
➂
➀
➁
➄
min.
max.

Deltabar S FMD76/77/78, PMD70/75 with FOUNDATION Fieldbus Installation
Endress+Hauser 15
• Mount the Deltabar S directly on the container. ä18, Section 3.3.5 "Seal for flange
mounting".
• Always connect the impulse piping of negative side above the maximum level.
• A condensate trap ensures constant pressure on the negative side.
• When measuring in media with solid parts, such as dirty liquids, installing separators and drain
valves is useful for capturing and removing sediment.
3.3.3 Installation for differential pressure measurement
Differential pressure measurement in gases and steam with PMD70/PMD75
P01-PMD75xxx-11-xx-xx-xx-006
Fig. 15: Measuring arrangement for differential pressure measurement in gases and steam with PMD75
1 Deltabar S, here PMD75
2 Three-way valve manifold
3 Shutoff valves
4 e.g. filter
• Mount the Deltabar S above the measuring point so that the condensate can run off into the
process piping.
Differential pressure measurement in liquids with PMD70/PMD75
P01-PMD75xxx-11-xx-xx-xx-007
Fig. 16: Measuring arrangement for differential pressure measurement in liquids with PMD75
1 e.g. filter
2 Shutoff valves
3 Deltabar S, here PMD75
4Separator
5 Drain valves
6 Three-way valve manifold
+
➂
➀
➁
➂
➃
+–
➂
➅
➁➁
➄
➃
➄
➃
➀

Installation Deltabar S FMD76/77/78, PMD70/75 with FOUNDATION Fieldbus
16 Endress+Hauser
• Mount the Deltabar S below the measuring point so that the pressure piping is always filled with
liquid and gas bubbles can run back into the process piping.
• When measuring in media with solid parts, such as dirty liquids, installing separators and drain
valves is useful for capturing and removing sediment.
Differential pressure measurement in gases, steam and liquids with FMD78
P01-FMD78xxx-11-xx-xx-xx-000
Fig. 17: Measuring arrangement for differential pressure measurement in gases, steam and liquids with FMD78
1 Diaphragm seal
2 Capillary
3 e.g. filter
4 Deltabar S, here FMD78
• Mount the diaphragm seal with capillaries at the top or on the side on the piping.
• For vacuum applications: mount the Deltabar S below the measuring point. ä17,
Section 3.3.4, "Vacuum application (FMD78)".
• The ambient temperature should be the same for both capillaries.
3.3.4 Installation instructions for devices with diaphragm seals
(FMD78)
!Note!
• The diaphragm seal, together with the pressure transmitter, forms a closed, calibrated system,
which is filled through openings in the diaphragm seal and in the measurement system of the
pressure transmitter. These openings are sealed and must not be opened.
• Do not clean or touch diaphragm seals with hard or pointed objects.
• Do not remove the protection of the process isolating diaphragm until shortly before installation.
• When using a mounting bracket, sufficient strain relief must be ensured for the capillaries in order
to prevent the capillary bending down (bending radius 100 mm (3.94 in)).
• Please note that the hydrostatic pressure of the liquid columns in the capillaries can cause zero
point shift. The zero point shift can be corrected. ä54, Section 6.4 "Position adjustment".
• Please note the application limits of the diaphragm seal filling oil as detailed in the Technical
Information for Deltabar S TI00382P, "Planning instructions for diaphragm seal systems" section.
ä2, "Overview of documentation".
In order to obtain more precise measurement results and to avoid a defect in the device, mount the
capillaries as follows:
• Vibration-free (in order to avoid additional pressure fluctuations)
• Not in the vicinity of heating or cooling lines
• Insulate if the ambient temperature is below or above the reference temperature
• With a bending radius 100 mm (3.94 in).
• The ambient temperature and length of both capillaries should be the same when using two-sided
diaphragm seal systems.
• Two diaphragm seals which are the same (e.g. with regard to diameter, material, etc.) should
always be used for the negative and positive side (standard delivery).
+–
➂
➁
➃
➀
➁

Deltabar S FMD76/77/78, PMD70/75 with FOUNDATION Fieldbus Installation
Endress+Hauser 17
P01-FMD78xxx-11-xx-xx-xx-005
Fig. 18: Mounting Deltabar S, FMD78 with diaphragm seals and capillaries, recommended mounting for vacuum
applications: mount pressure transmitter below the lowest diaphragm seal!
Vacuum application (FMD78)
For applications under vacuum, Endress+Hauser recommends mounting the pressure transmitter
underneath the lower diaphragm seal. A vacuum load of the diaphragm seal caused by the presence
of filling oil in the capillaries is hereby prevented.
When the pressure transmitter is mounted above the lower diaphragm seal, the maximum height
difference H1 in accordance with the illustration below left must not be exceeded. The maximum
height difference depends on the density of the filling oil and the smallest ever pressure that is
permitted to occur at the diaphragm seal on the positive side (empty container), see illustration
below right.
+ –
+
–
≥100 mm
P01-FMD7xxxx-11-xx-xx-xx-001
Fig. 19: Installation above the lower
diaphragm seal
P01-FMD78xxx-05-xx-xx-en-017
Fig. 20: Diagram of maximum installation height above the lower
diaphragm seal for vacuum applications depending on the
pressure at the diaphragm seal on the positive side
+ –
+
–
H1
–+
0.0
2.0
4.0
6.0
8.0
10.0
12.0
50 100 300 400 500 600 700 800 900 1000
200
Inert oil
High temperature
oil
Vegetable oil
Silicone oil
Pressure, diaphragm seal positive side [mbarabs]
Height difference H1 [m]
Low temperature oil

Installation Deltabar S FMD76/77/78, PMD70/75 with FOUNDATION Fieldbus
18 Endress+Hauser
3.3.5 Seal for flange mounting
P01-FMD7xxxx-11-xx-xx-xx-002
Fig. 21: Mounting the versions with flange or diaphragm seal
1 Process isolating diaphragm
2Seal
#Warning!
The seal is not allowed to press on the process isolating diaphragm as this could affect the
measurement result.
3.3.6 Heat insulation – FMD77
The FMD77 must only be insulated up to a certain height. The maximum permitted insulation
height is indicated on the devices and applies to an insulation material with a heat conductivity
0.04 W/(m x K) and to the maximum permitted ambient and process temperature (see table
below). The data were determined under the most critical application "quiescent air".
P01-FMD77xxxx-11-xx-xx-xx-000
Fig. 22: Maximum permitted insulation height
➁➀
λ0.04≤W
mK•
TA
TP
FMD77
Ambient temperature (TA)70°C (158°F)
Process temperature (TP) Max. 400°C (752°F), depending on the diaphragm
seal filling oil used (see Technical Information
TI00382P Deltabar S)

Deltabar S FMD76/77/78, PMD70/75 with FOUNDATION Fieldbus Installation
Endress+Hauser 19
3.3.7 Wall and pipe-mounting (optional)
Endress+Hauser offers a mounting bracket for installing the device on pipes or walls. A holder with
mounting accessories for pipe mounting is included with the device.
!Note!
When using a valve block, the block's dimensions must be taken into account.
P01-xMD7xxxx-11-xx-xx-xx-008
Fig. 23: Mounting bracket for wall and pipe mounting
1 Device mounting
Please note the following when mounting:
• Devices with capillary lines: mount capillaries with a bending radius 100 mm (3.94 in).
• To prevent the mounting screws from scoring, lubricate them with a multipurpose grease prior to
mounting.
• When mounting on a pipe, tighten the nuts on the bracket uniformly with a torque of at least
30 Nm (22.13 lbf ft).
106
74
74
12
124
135
37.5
➀

Installation Deltabar S FMD76/77/78, PMD70/75 with FOUNDATION Fieldbus
20 Endress+Hauser
3.3.8 Assembling and mounting the "separate housing" version
P01-xMD7xxxx-11-xx-xx-xx-011
Fig. 24: "Separate housing" version
1 In the "separate housing" version, the sensor is supplied with the process connection and cable ready-fitted.
2 Cable with connection jack
4Plug
5Lockingscrew
6 Housing fitted with housing adapter, included
7 Mounting bracket suitable for wall and pipe mounting, included
Assembly and mounting
1. Insert the 10-pin connector (item 4) into the corresponding connection jack of the cable
(item 2).
2. Plug the cable into the housing adapter (item 6).
3. Tighten the locking screw (item 6).
4. Mount the housing on a wall or pipe using the mounting bracket (item 7).
When mounting on a pipe, tighten the nuts on the bracket uniformly with a torque of at least
5 Nm (3.69 lbs ft).
Mount the cable with a bending radius (r) 120 mm (4.72 in).
r³120 mm
1
2
4
5
6
7